CMY & CMYK

CMY - CMY model is a model that describes colors on passive media - that is, which only reflect light, eg. Images or photographs in contrast to the active media that emit light, for example monitors.

CMYK - a set of four basic color inks commonly used in printing in multicolor printing and related methods.

CMYK is derived from the first letters of the names of colors: cyan, magenta, yellow, black.